[NTG-context] Font features

Hello, I also have a question about font features. Minion Pro has old style numerals. How to display them, provided that I enabled this feature? In the following test script, I get ordinary numbers, no old style. \starttypescript [serif] [MinionPro] \definefontsynonym [Serif][MinionPro-Regular.otf][features=onum] \stoptypescript \starttypescript [MinionPro] \definetypeface [MinionPro][rm][serif][MinionPro][features=onum] \stoptypescript \usetypescript[MinionPro] \setupbodyfont[MinionPro,16pt] \starttext This is bla bla bla 1234567890. \stoptext Regards, Vyatcheslav